Bullet retainer for gun perforators



Sept. 29 1942- A. J. zscHoKKE 2,296,971

BULLET RETAINER FOR GUN PERFORATORS Filed Feb. 14, 1941 -liww v nh lrazJ ha@ r fief-ffm@ LZ'scf/wrf INVENTOR BY @www ATTORN EY Paientedseptlm zum noun mma ron GUN rrnroaarons Arthnrl.zeehekke.lluntiagtonhrk.0alifal ignari Lane-Wella Ce-panLLeaAngeiea. Calneorporatienefbelaware 14, 1941, sani No.' zum (ci. :o4-a5) I Claims.

My 4invention relates to bullet retainers for gimrperiorators. and anions the objects-oi my invention are:

lydesignedioruleinalunperfoxator itthetypeshowni'n the'lumchekratent Nm 3,218,146 and in the Barnum Patent No. 2,210,151: Second. to provide a bullet retaining means whicheerveehothti'iholiltheliuiietlainstl inwardmovementbyreaaonoihydroetaticpreaanreexertedbyliquidinwhiehthezunisimmereedandtoreeiltmomentarilyinternalpreecureelwiienthegimcartridzeisnredwhichhaa the'elect oiincreasinzecceierationoithebilet andconeequentlyJtepenetratin! portier;`

Third,tonrovideabulletretainerwhichis thenexpnndedradially-tocecurethebmlet;

mrmtoprovideahulletretainerandnovel meamoiexnandinltheretalneratterthemillet hasbeeniiuertediand lllitli, to Provide a bullet retainer which tends to torni a sealins rino aroundthe end o! thebulletduringdixcharteotthebulletaoas tominimizetheiiowoitheexplosive past thesideeoi'thebullet.

Withtheaboveandotherobiectsinviemas mayappear hereinafter. reference is directed to thedrawinminwhich:

lllgurelia'atransverseeectional view through i--loflllgurezofagimpertoratorbodyoithe type shown in the hereinbeiore mentioned patents and which incorporates my invention:

l'igureziaa iragmentary'longitndinal sectional viewthereot,through22 otll'izure 1;

Figure 3 isa fragmentary l sectional viewxlmllartoi'lgurelyahowingthemannerin whiehthebulletretaineriaintopo` a further modled form o! bullet retainer, the

bullet being shown in elevation; and

Pleure 8 ia a similar sectional view thereof showingthebulletinpositioninthegunbody andindicatingalaothe anvil employed todeiorm tiiefretainer.v

With reference iirst to the construction shown 65 by roam in Figures l. 2, 3 and 4, the gun periorator which incorporates my invention comprises a gun body I oi cylindrical form in which are drilled laterallyaplurality cigunbores. Eachgunbore is intersected near its inner end by a cartridge bore 3 which receives a main cartridge I. The inner end o! the gun bore receives an auxiliary or secondary cartridge i. The outer end of the cartridge bore I is threaded and receives a plug t. A bullet l nts each :un bore. The outer end of the bullet is covered by a sealing member 8 formed of rubber or similar material.

My invention concerns retaining means secured to the inner end oi the bullet. In Figures l 'through 4 this takes the form of a bullet retainer" stamped Afrom sheet material to form a base i2 which is spotwelded or otherwise secured to the bullet and a skirt Il which initially has a diameter equal to that oi the bullet, so that .the bullet may be inserted through the gun bore.

Adjacent the cartridge bore 3 the gun bore 2 is counterbored to form a rudimentary groove It, into which the skirt Il of the retainer may be expanded. This is accomplished, as shown in Figures 3 and 4, by means of a forming anvil 2l which is Vadapted to be'inserted through the cartridge bore 3. The forming anvil is equal in diameter to the cartridge bore and provided with a conical end for coaction with the skirt i3 oi the bullet retainer. The anvil is so shaped 4that it may be inserted and removed from the cartridge bore and may be provided with a sultable handle 22. The anvil is backed by apair 'ot coacting wedge members 2l and 24. one ci `slrirtrnayheceuedtoexpendinitiallyintothe emmterbore il, whereupon the anvil may be driven forwardly while the skirt is held to further shape the skirt into coniormity with the countenbore Il until it assumes the Iposition shown in Figures l and 2.

The retainer when deformed into the counterborebearaagainstthexhmildenwhichdednethe counterbore and holds the bullet against either inward or outwardmovement and is sumcientiy strongtopreventinwardmovementotthebullet otthehydroltaticpressureottheliquid in which the gun periorator may be submerged. In this connection, it should be noted that a gun periorator may be submerged to depths greater than 10,0000 reet and, therefore, subjected to a hydrostatic pressure of several thousand pounds per square inch.

Wlren the cartridge is ignited the retainer resists the initial pressures to give time :for more complete combustion, with the result that when the retainer does give way greater acceleration is imparted to the bullet. This is particularly desirits margins held by the rim 33 and its central` portion extending outwardly from the bullet. The initial diameter of the retainer 3| is equal to'that 0i' the bullet so that it may be inserted into the gun bore. At the inner end of the gun bore thereis provided a rounded rudimentary groove 3i into .which the rim 3l is expanded when the expander disk Il is pressed ilat, as shown in Figure 8. This may be accomplished by an anvil arrangement (not shown) similar to that shown in Figures 2 and 3. It will be observed that only a rudimentary groove is required. However, a material amount of the metal comprising the retainer must be sheared before the bulletvis released, for the internal pressure of the ignitedcartridge tends to maintain the expander disk fiat and the pressure within the rim tends to expand it further into the groove.

' Reference is now directed to Figures 'I and 8: the construction here shown comprises a retainer Il having a base 42 and a rim or skirt 4I having an initial diameter equal to that of the bullet.

This rim or skirt is similar to that shown inthe iirst described structure. The retainer is iilled,

stamani.`

ena of am bullet, ma having m mmm annular skirt. laid skirt having'initlally a diameter however, with an expander plug Il formed of lead or other comparatively soit material. The plug extends beyond the rim I3. Therm: II is expanded into a counterbore Il by driving the bullet inwardly so tha-t the expander plug Il engages an anvil Il inserted through the cartridge bore. The anvil in this case may be merely a cylindrical rod. The expander plug ll is deformed in forcing the rim 43 radially, the inner end of the expander plug conforming to the surface of the anvil, ,as shown best in Figure 8.

In the several constructions shown, it is intended that the secondary cartridge 5, if such is z provided, be inserted through the cartridge bore 3 after the bullet has been positioned However,

' it is possible to insert the cartridge ilrst, prol Y viding an explosive which is not readily detonated x' equal to the bullet whereby the bullet may be through said gun bore and said skirt adapted to be deformed radially into said counterbore to secure said bullet in the gun bore.

2. The combination with a gun perforatnr having a gun bore in which is formed a counterbore, and a gun periorator bullet, of a retainer comprising: a cup-shaped disksecured to said bullet, and having an integral skirt ntting said counterbore.

3. The combination witha gun periorator having a gun bore and a traversing crossbore, and a` bullet iitting saidv gun bore, oi a bullet retainer comprising: means denning a counterbore adiacent said cross bore; and a retainer member secured to said bulletv and having an integral mars gian skirt deformed into said counter-bore.

4. The combination witha gun perforator hav- A retainer comprising: means defining a counterbore near the inner end of said 'gun bore: a retainer secured to said bullet and having an initialI diameterl fitting the normal diameter of said gun bore; and means for deforming said retainer into locking engagement with the walls 0f said counterbore.

B. The hcombination with a gun perforator havingagunboreandacartridgechamberincommunication therewith, and a bullet, of a bullet retainer comprising: means defining a counterbore near the inner end of said gun bore; a cupshaped retainer secured to the bullet and hav-.- ing an initial diameter permitting passage through said gun bore; and anexpander carried by vsaid retainer 4for urgingv the margins o! said retainer into said ,counterbore 7. The combination with a gun periorator having a gun bore and a cartridge chamber in communication therewith, and a bullet. of a bullet retainer comprising: means defining a counterbore near the inner end of said gun bore; a cupshaped retainer secured-to the bullet and having an initial diameter permitting passage through said gun bore; an expander carried by said retainer ior urging the margins of said retainer'v into said counterbore; said expander being a deformable plug of relatively soft material.

8. The combination with a gun pericrator having a gun bore and a cartridge chamber in communication therewith, and abullet, of a bullet retainer comprising: means defining a counterbore near the inner end o! said gun bore; a cupshaped retainer secured to the bullet and having an initial diameter permitting passage through said gunbore; an expander carried by said retainer for urging the margins of Asaid retainer into said counterbore: said expander being initially in the form o! a convex disk iltting within said retainer and adapted when flattened to expand said retainer radially. r 

